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Directions for Use:-1.Take 25 nil of water sample to be tested in the test jar.2.Add one spoonful provided herewith) of TH 1 5.3.Mix contents well to dissolve.4.Add 10-12 drops:* of TH 2 and mix contents well.5.If colour turns blue, it indicates there is 'No Hardness' in the water6.If colour turns red, it indicates there is 'Hardness'.7.Now drop wise* add TH 3, counting the number of drops while mixing, until the colour changes from red to blue.If the expected hardness of the test sample is more than 40 ppm, then use TH 4 'Analyzing Waters instead of TH Calculations: Total Hardness as ppm CaCO3 =2 x (Number of drops of TH ? v E= 5 x (Number of drops of TH 4).